Finding the Fourth Proportional to 12,780.02, 17,636.46 and 7,191.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.02 : 17,636.46 = 7,191.02 : x
2. Step 2: Convert to fraction form
   12,780.02/17,636.46 = 7,191.02/x
3. Step 3: Cross multiply
   12,780.02x = 17,636.46 × 7,191.02
4. Step 4: Simplify right side
   12,780.02x = 126,824,136.59
5. Step 5: Solve for x
   x = 126,824,136.59/12,780.02
6. Step 6: Final answer
   x = 9,923.63